Convert decimal to hexadecimal

using System;
using System.Collections.Generic;

class DecimalToHex
{
    static void Main()
    {
        string input = Console.ReadLine();
        PrintReversed(ConvertDectoHex(input));
    }
    static List<char> ConvertDectoHex(string number)
    {
        int numInt = Int32.Parse(number);
        int index = -1;
        List<char> result = new List<char>();
        while (numInt >= 1)
        {
            result.Add('0');
            int reminder = numInt % 16;
            index++;
            switch (reminder)
            {
                case 10: result[index] = 'A'; break;
                case 11: result[index] = 'B'; break;
                case 12: result[index] = 'C'; break;
                case 13: result[index] = 'D'; break;
                case 14: result[index] = 'E'; break;
                case 15: result[index] = 'F'; break;
                default: result[index] = (char)(reminder+48); break;
            }
            numInt = numInt / 16;
        }
        return result;
    }

    static void PrintReversed(List<char> arr)
    {

        for (int i = arr.Count-1; i >= 0; i--)
        {
            Console.Write((char)(arr[i]));
        }
        Console.WriteLine();
    }
}